Amazing brooch here, from the late 30s.  There are some rhinestones that have yellowed and need to be replaced, but that's an easy fix.  There are also two flaws on the side of the pearl.  It's marked sterling, patent pending, and Crown Trifari.  It's so special. The fastener is unique, a combination of fur clip and pin with safety fastener.

Thanks for looking, and please take a look at my other listing for other beautiful vintage pieces.